Artificial tooth.



A. N. CROSS.

ARTIFICIAL TOOTH.

APPLICATION mm mm 20. I919.

Patented Mar. 11, 1919.

UNITED STATES PATENT OFFICE. I

ARTHUR N. onoss, or PHILADELPHIA, PENNSYLVANIA. V

ARTIFIGIAL TOOTH.

1,296,928. Original application filed February 1,

ent application is to provide a secure moimt ing for artificial teeth ofvarious characters where porcelaintooth cusps or facings are employed; the construction of my invention being suchas to securely hold the porcelain tooth cusps or facings to a backing which includes an angularly bent plate.

Another object is to so construct. my invention that itwill be readily adaptable for teeth of various shapes and can be used with advantage in connection with'caps and bridges.

Another object is toso design my invention that it will be durable and can be gpickly and easily manufactured and assem- These objects, andfother advantageous ends which will be described hereinafter, I attain in the following; manner, reference being had to the accompanying drawings in which Figure 1 is a detached central sectional elevation showing .my improved backing plate having portions arranged at an angle to fit an all-porcelain tooth'cusp.

Fig. 2 is a sectional view showing the backing and the tooth cusp of Fig. 1 joined together and positioned ready to be soldered to what is known as a Richmond cap.

Fig. 3 is a perspective view of my improved backing, as shown inFigs. 1 and 2.

Fig. 4 is a perspective view of a modified form of my improved backing plate.

Fig. 5 is an elevation, partly in section, showing how the form of my improved backing, shown in Fig. 4, is attached to a porcelain tooth cusp and positioned on a Richmond cap ready to be securedthereto.

Fig. 6 is a sectional elevation of the por- Specification of Letters Patent.

Patented Mar. 11, 1919.

celain tooth cusp of Fig. 5 with the backing plate removed.

Fig. -7 is an inverted sectionalplan' view 1917, Serial N 0. 145,838. Divided and this application filed January 20, 1919. Serial No. 271,946.

taken through the rib of my improved backing plate in which the rib is produced by pressing the backing plate.

Fig. 8 is an inverted sectional plan View takenon the line 8-3 of Fig. 9 and showing my improved backing made entirely of a single solid piece of metal.

Fig. 9 is a sectional elevation taken on th line 99 of Fig. 8, and

Fig. 10 is a perspective view of bridge illustrating how my invention is applicable 7 in securing tooth cusps thereto.

Referring to the drawings, Fig. 1 shows a form of my invention in which a metallic backing plate 30 is bent at an angle to engage the angularly disposed surfaces 35 and 36 of a porcelain tooth cusp 38. The cusp 38 has a cavity 39 extending inwardly from the junction of the surfaces 35 and 36, said cavity extending at an incline or angle to the direction of the biting movement which, in

the drawing, is indicated by the arrow in; said cavity being rectangular in cross section. The surface 36 of the tooth cusp 38 is provided with a groove 40 which extends transversely to the cavity 39, as clearly cross section, projects from. thebacking plate 5? 30 at the junction of the portion 42 with the portion 44; said tongue, in the present instance, being illustrated as a separate piece of metal which can be soldered or otherwise secured Within a hole 45 in said plate '30 and is adapted to fit Within the cavity 39. r

Fig. 2 shows the metallic backing plate secured to the cusp 38 with the portions 42 and 44 of the plate 30 fitting against the surfaces 36 and 35 and the rib 41 and tongue 43 fitting, respectively, within the groove 40 and cavity 39. Suflicient cement can be interposed between the parts to provide an adhesion to prevent the detachment of the several parts.

In Fig. 2, the parts above described are shown in a position mounted above a Rich mond cap 46 and, when in this position, the plate 30 can be soldered to the top of said cap to provide an integral structure.

In Fig.4 have showna modifiedrsform of the bent plate and tongue structure in which 47 represents the bent plate having fiat angular portions 48 and 49. The tongue 50 intercepts the portion 48 between its edge 51 Fig. 5 shows the backing of Fig. 4 ap- 1 plied to a tooth cusp 53 which is providedv with two inwardly extending flat surfaces 55 and 55 a cavity 54 in which the tongue 50 fits, and a groove 40? in whichthe rib- 41 fits. Inkthis form of my'invention, the cavity 54 extends inwardly from the flat surface 55 of thetooth cusp 43'. However, the cavity 54 and tongue 50 extend at an incline to the direction of the bite, as indicated by the arrow y, so that during the action of the tooth, there is practically no chance of fracture of the cusp which is usually made of porcelain. Fig. 5 also shows the parts in arrangement above a Richmond cap 56.

In Figs- 8 and 9 I have illustrated my improved backing plate 47 rib 57 and tongue 50 all made from a. single solid piece of 5 metal and in which all of the parts ar'emade reference numerals.

integral. In all other respects this form of my invention is similar to that described in connection with Figs. 4 and 5 and I have, therefore, given similar parts corresponding In Fig. 10 I have illustrated a bridge 59 which can be constructed by using the structure of my present invention in which the body portion 59 of. the bridge includes bent 1 plates 60 and 61 which can be mounted to support the various forms of teeth, the plate '61 being connected to a Richmond cap 62 while the plate 60 is connected directly to the body portion 59 and can be used to support a tooth cusp such, for example, as the V Gopies'ot this patent may be obtained for tooth cusp shown at 63. The end of the bridge can be provided with a molar crown 64 which can be constructed in the usual manner and preferably made of gold.

By the construction of my invention, as above described, the bent backing plate will provide a durable and strong support for the tooth cusps orfacings. The combination of the rib and tongue in respect with the groove and cavity of the tooth cusp serves to securely lock the backing to the tooth cusp. Furthermore, by arranging the angular backing plate and the tongue and cavity, as above described, the biting'movement of the sure, for example, as in the direction of the arrows to and z in Figs. '1 and 2, will cause a binding action between the bent outer surfaces of the plate, tongue and the backing portion of the tooth cusp.

I/Vhile I have described my invention as taking a particular form, it'wil-lbeunderstood that; the various parts of my invention may be changed without departing from the spirit thereof, andvhence I donot limit myself to the precise construction set forth, but consider that I am at liberty to make such changes and; alterations as fairly come within the scope of the appended claims.

Having thus'describe'd my invention, what i I claim as new and desire to secure by Letters Patent is: V o

1. An artificial tooth having a facing,.said facing including two flat surfaces extending inwardly at an incline tofeach other; a cavity extend-ing into said facing and intercepting at least one of said faces, saidcavity extending at an incline to the direction of the biting .movement of the tooth; and a plate having surfaces bent at an angle to each other and adapted to fit against the fiat surfaces of said facing, said plate having a tongue extending therefrom in the direction of and adapted to fit within said cavity, substantially as described. 7

2. An artificial tooth having a facing, said facing including two flat surfaces extending inwardly at an incline 'to each other, a cavity extending intosaid'facing and intercepting at, least one of said faces, said cavity extending at an incline to the direction of the biting movement of thetooth; and aplate having surfaces bent at an angle to each other and adapted to fit against the flat surfaces of said facing, said plate having a tongue extending therefrom in the direction of and adapted to fit within said cavity, said facing havlng a groove extending transversely to said cavity, said plate having a rib adapted to fit within saidgroove; substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

"ARTH R N. onos's. WVitnesses V MARY A. INcnon, 'CHAS. E; Po'r'rs.

five cents each, by,addrssing the Gommissionerpf Patents, Washington, 13.0. v T 

